import java.util.*;
public class Example3_9 {
    public static void main (String args []) {
    Scanner reader = new Scanner (System.in);
    double sum = 0;
    int m = 0;  
    while (reader.hasNextDouble()) {
    double x = reader.nextDouble();
    m = m+1;
    sum = sum+x;
    }
    System.out.printf("%d个数的和未%f\n",m,sum);
    System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}
